Here is the full list of all 17 Supraland Demo achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
Drive the plot forward
Found holy sword upgrade
Found Telefrag Upgrade
Found Armor
Not even once? Nothing is being cooked.
Reached top of the hill
Nom nom
Found a healthbar
Bought Triple Jump Upgrade
Bought Double Jump Upgrade
Bought a Force Cube
Unlocked Speed x2
Got Health Regeneration Upgrade
Perfect 5/7 experience
Find out what they are up to
The first secret area in the game
Made your first step